AP BIOLOGY

Detailed explanation-1: -Darwin was proposing that life began, not in the open ocean, but in a smaller body of water on land, which was rich in chemicals. This is in essence the primordial soup idea, but with one advantage: in a pool, any dissolved chemicals would become concentrated when water evaporated in the heat of the day.

Detailed explanation-2: -Darwin proposed that species can change over time, that new species come from pre-existing species, and that all species share a common ancestor. In this model, each species has its own unique set of heritable (genetic) differences from the common ancestor, which have accumulated gradually over very long time periods.

Detailed explanation-3: -Darwin argued that, in what he called higher animals or plants, every cell in their bodies emitted small particles, which were units of heredity, that he called gemmules. The gemmules could either circulate and disperse in the body system, or they could aggregate in the sexual cells located in reproductive organs.

Detailed explanation-4: -In the Origin of Species, Charles Darwin says little about human evolution, other than to assert firmly that we humans did evolve and are part of the interrelated natural world along with all other organisms.